experiment

EXPERIMENT :

USING R75 AND LOOP ANTENNA 1 x 1 m

1st part:

Checking loop antenna in inductive or direct connection

Date of experiment : 9/2/2k

QTH: Retziki 20N 23E Thessaloniki , reception made outdoors ( not inside the house)

An experiment with this 1 x 1 m loop antenna , with direct connexion and inductive tuned connection

The antenna was in fixed position Preamp was on ( + 10 db)

Result:

Direct connection does not offer antenna tuning operation , but shows a constant (?) gain on all the LF bands but inductive coupling can offer better signals abt 12-15 db

Legend :

QRG : frequency

Win: windings

S ; S meter with inductive coupling , properly tuned

S- direct : direct connection to receiver

S meter readings: S2/S1 = 6 db ( 4 times stronger)

Over S9 readings always per 10 db ( x 10)

PART 2

Resonance of the 1 x 1 m antenna

Mysteriously , the 1 x1m antenna shown some resonance with ONLY the wideband receiver MVT7100 by direct or by indirect (inductive coupling) but with R-75 it did not shown any resonance except what the R-75 should listen !

Direct connection with MVT 7100 :

Inductive coupling with 900 pF capacitor ( always used) and MVT7100 and 3 m double wire connection

Part 3

LOGS MADE WITH THE 1 x 1 m antenna

Date: 11-2-2k